I know I use the terms and abbreviations which is fairly common in pregnancy forums and blogs, so here is a list of pregnancy related abbreviations for those who are new in this:

0 - 9
2WW (aka. TWW) - Two Week Wait - Luteal Phase - 14 days after ovulation 

A
AF - Aunt Flo, menstruation, period 
AI - Artificial Insemination 
AKA - Also Known As 

B
BBT - Basal Body Temperature 

BD - Baby Dance, Sex 
Beta - Blood test for PG 
BFN - Big Fat Negative (Pregnancy Tests) 
BFP - Big Fat Positive (Pregnancy Test) 
BTW - By the way 
BC - Birth Control 
BCP - Birth Control Pills 
BM - Breast Milk
BPM - Beats per minute
BOB - Baby on board

C
CB - Clear Blue Pregnancy Test 
CBFM - Clear Blue Fertility Monitor
CD - Cycle Day 
CL - Corpus Luteum 
CM- Cervical Mucus, Icky Sticky
CP - Cervical Position 
C# - Cycle Number 
CP - Cervical Position 

D
DPO - Days Past Ovulation 
DTD - Doing The Dance, BD, sex
DPT - Days Post-Transfer 
D&C - Dilate and Curetage

E
EC - Embryo Cyro/Freezing 
EDD - Estimated Due Date 
EPO - Evening Primrose Oil 
EWCM - Egg-White Cervical Mucus 
ER - Egg Retrieval 
ET - Egg transfer 
EPT - Early Pregnancy Test 
EPU - Early pregnancy unit
ETA - Edited to add
EVAP - Evapouration

F
FMU - First morning urine
FOB - Father of baby
FRER - First Response Early Result (Pregnancy Test)
FXed - Fingers crossed
FRER - First response early result
FAO - For attention of

G
GP - General Practitioner 
Gyno - Gynocologist

H
HCG - Human Chorionic Gonadotropin - detected in HPTs 
HPT - Home Pregnancy Test 
HSG - Hysterosalpingogram - x-ray 
HB - Heartbeat

I
ICSI Microfertilization 
IUI - Intrauterine Insemination 
IVF - In Vitro Fertilization 
IC - Internet Cheapie
IYKWIM - If you know what i mean
IRL - In real life
IYO - In your opinion
IMO - In my opinion
IB - Implantation bleeding

K
KEGELS - The muscle used to stop the flow of urine. 

L
LH - Luteinizing Hormone - detected in OPKs 
LOL - Laughing Out Loud 
LP - Luteal Phase, days between ov & AF 
LAP - Laparoscopy 
LMP - Last Menstrual Period 
LSP - Low Sperm Count 

M
MC, m/c - Miscarriage 
MMC - Missed miscarriage
MF - MaleFactor 
M/S, MS - Morning Sickness 
NP - No Problem 

N
NTNP - Not trying, not preventing

O
O or OV - Ovulation 
OH - Other Half
OPK - Ovulation Predictor Kit 
OB/GYN - Obstetrician/Gynecologist 
OP - Original poster

P
PG - Pregnancy, pregnant 
PNV - Prenatal Vitamin 
PCO - Polycystic Ovaries 
PCOD - Polycystic Ovary Disease 
PCOS - Polycystic Ovary Syndrome 
PMA - Positive mental attitude
PMS - Pre-menstrual Syndrome 
POAS - Pee on a stick (Home Pregnancy Test) 
PND - Post Natal Depression
PGP - see SPD

R
RE - Reproductive Endocronolgist - doctor who specializes in fertility problems 
R-FSH - Recombinant Human Follicle Stimulating Hormone 
ROBI - A term used which refers to Robitussin or Guaifenesin Syrup (expectorant) used to thin CM 


S
SOD - Sex on Demand 
SA - Semen Analysis 
SAHM - Stay at Home Mom 
SAHD - Stay-At-Home Dad  
STD - Sexually Transmitted Disease 
SMEP - Sperm meets egg plan
SPD - Symphisis pubis dysfunction - Also know as PGP, Pelvic girdle pain

T
TR - Tubal Reversal 
TTC - Trying To Conceive 
TMI - Too Much Information 
TR - Tubal Reversal 
TWW - Two week wait

U
U/S - Ultrasound 
UTI - Urinary Tract Infection